Locks that work

Unfortunately, I'm not an engineer, so do not have the means to test them. I am a security professional, that normally works within a corporate environment - designing and implementing security procedures for large companies. This thread was just a community spirited effort on my part.

I can acknowledge that when I first started compiling info for the thread, your company was one prominent source of comparative information. I trusted it, and was right to do so.

Glad to have been a help. We are pretty un-biased wrt locks & D-locks and are genuinely interested in what is good and what isn't for real-world situations. I am rather limited in what I can say about some things as I can't give thieves tips on weaknesses in certain products etc, and I don't want to get sued by stating an opinion borne out through our own experience. Suffice it to say, though, that of the D-lock manufacturers mentioned in this thread, I would only consider buying a D-lock made by Squire (high-end of the range), Kryptonite (ditto), or Abus (ditto), and Artago have some good D-locks, too (but probably too heavy for bicycle use). I will also add that there is a huge difference between good quality tools, used properly, and not. I do smile about some of the attack times quoted as some of the magazines etc are not very good at testing ;-) I echo guidance here that cheap locks are generally not appropriate for expensive bikes and can be a false economy. Police guidance is you should budget 10-15% of the item's value on its security.

I hope that helps.